After running PerlTidy on it, you should sprinkle it with fragrant bouquets of B::Deobfuscate to remove the code smell.

My guess is that the obfuscation is there so that you are hindered seeing through their activation process - the "Pro" in the release/version hints to me that this is a for-pay release and thus they want to see some money before they activate your copy of Trixbox.